This is an 8 bit ( led ) x 2 display, A Blue led display and a White led display.
Via slip ring +5 volt and 2 serial IN lines, one for the Blue and the other for the White leds.
Each display has its own ATmega to handle serial data in and timing / driving of the leds.
The PCB is laser printed paper glued to a bakelite or fiberglass blank PCB, then hand drilled with Dremel.
All Schematics, Arduino codes, and more details can be seen here at Instructables-- POV danno1802
I love the concept of two, back-to-back, POV displays floating in mid-air! This is genius!